eng.razi.ac.ir¬لسه دوم.pdf · pda (p + dp) da w ydrda b dr , e fn = ma (p + dp) d.4 —...
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- eng.razi.ac.ir¬لسه دوم.pdf · pdA (p + dp) dA W YdrdA b dr , E Fn = ma (p + dp) d.4 — pd.-4 — dr dA cos B = p d.4 dr . sys
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Post on 18-Jan-2021
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